Better PDM for ESP32

sensorium · Jan 26, 2025 · 14952b5 · 14952b5
1 parent 26d9d58
commit 14952b5
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Showing 2 changed files with 4 additions and 2 deletions.
diff --git a/internal/MozziGuts_impl_ESP32.hpp b/internal/MozziGuts_impl_ESP32.hpp
@@ -79,8 +79,10 @@ namespace MozziPrivate {
   inline bool esp32_tryWriteSample() {
     size_t bytes_written;
     //i2s_write(i2s_num, &_esp32_prev_sample, ESP_SAMPLE_SIZE, &bytes_written, 0);
-    #if MOZZI_IS(MOZZI_AUDIO_MODE, MOZZI_OUTPUT_I2S_DAC) || MOZZI_IS(MOZZI_AUDIO_MODE, MOZZI_OUTPUT_PDM_VIA_I2S)
+    #if MOZZI_IS(MOZZI_AUDIO_MODE, MOZZI_OUTPUT_I2S_DAC)
         i2s_channel_write(tx_handle,_esp32_prev_sample, 2*sizeof(_esp32_prev_sample[0]), &bytes_written, 0);
+    #elif MOZZI_IS(MOZZI_AUDIO_MODE, MOZZI_OUTPUT_PDM_VIA_I2S)
+	i2s_channel_write(tx_handle,_esp32_prev_sample, MOZZI_PDM_RESOLUTION*sizeof(_esp32_prev_sample[0]), &bytes_written, 0);
 	/* #elif MOZZI_IS(MOZZI_AUDIO_MODE, MOZZI_OUTPUT_INTERNAL_DAC)
     dac_continuous_write(dac_handle, _esp32_prev_sample, ESP_SAMPLE_SIZE, &bytes_written, 0);
 	*/

diff --git a/internal/config_checks_esp32.h b/internal/config_checks_esp32.h
@@ -189,7 +189,7 @@ MOZZI_CHECK_SUPPORTED(MOZZI_AUDIO_INPUT, MOZZI_AUDIO_INPUT_NONE)
 #if MOZZI_IS(MOZZI_AUDIO_MODE, MOZZI_OUTPUT_PDM_VIA_I2S)
 #  define MOZZI_I2S_FORMAT MOZZI_I2S_FORMAT_LSBJ  // pdm codes are for LSBJ format
 #  if !defined(MOZZI_PDM_RESOLUTION)
-#    define MOZZI_PDM_RESOLUTION 2  // we send two 16 bits values
+#    define MOZZI_PDM_RESOLUTION 8 
 #  endif
 #else
 #  define MOZZI_PDM_RESOLUTION 1  // unconditionally, no other value allowed